Article (Scientific journals)
Deconvolution with Correct Sampling
Magain, Pierre; Courbin, F.; Sohy, Sandrine
1998In Astrophysical Journal, 494, p. 472-477
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Keywords :
METHODS: DATA ANALYSIS; METHODS: NUMERICAL; TECHNIQUES: IMAGE PROCESSING
Abstract :
[en] A new method for improving the resolution of astronomical images is presented. It is based on the principle that sampled data cannot be fully deconvolved without violating the sampling theorem. Thus, the sampled image should be deconvolved not by the total point-spread function but by a narrower function chosen so that the resolution of the deconvolved image is compatible with the adopted sampling. Our deconvolution method gives results that are, in at least some cases, superior to those of other commonly used techniques: in particular, it does not produce ringing around point sources superposed on a smooth background. Moreover, it allows researchers to perform accurate astrometry and photometry of crowded fields. These improvements are a consequence of both the correct treatment of sampling and the recognition that the most probable astronomical image is not a flat one. The method is also well adapted to the optimal combination of different images of the same object, as can be obtained, e.g., from infrared observations or via adaptive optics techniques.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Courbin, F.
Sohy, Sandrine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Language :
English
Title :
Deconvolution with Correct Sampling
Publication date :
01 February 1998
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, Chicago, United States - Illinois
Volume :
494
Pages :
472-477
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 April 2010

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